加减混合计算24+48+17=2448+721897217++178989244872+1练一练8
852956-
85-29-48=练一练8529-56
5648-8
-4885+6-78+9-512-5+814-6+829-9+515+8-3口算6829-68-29+51=6829-39
3951+90139
+51901简便算法90356+24-30=67-34+29=做一做72-(47+16)=44716+1637263-9
932+(55-46)=5546-9+32414137+(50–26)70-(35+21)85-(32–18)32+(55-46)=76-(13+42)=做一做39561825+8-20476426332744613算一算25+36-47+58-23+19611472496849-25+18-38+78-6524424821764-(17+28)=291728+14526+(86-59)=53
8659-27+261536445-
26+(40-8)70-(23+35)81-52+4865+18–3940+(56–29)36-(78-56)